Membrane pinning on a disordered substrate

Details Membrane pinning on a disordered substrate Membrane pinning on a disordered substrate

2002-08-08

arxiv.org/abs/cond-mat/0208159v1

Physics

Condensed Matter

Soft Condensed Matter

7 pages, incl. 1 figure

Scientific paper

10.1209/epl/i2003-00107-2

We investigate interactions between an elastic membrane and a substrate characterized by quenched positional disorder in the height function. We show that the positional disorder transforms the standard secondary DLVO minimum into two separate states: the hovering state characterized by a planar membrane at a finite separation from the interface and a pinned state where the membrane follows closely the asperities of the substrate and is as a consequence quite corrugated. The transition between the two states is continuous and depends on the parameters of the underlying DLVO potential as well as the parameters describing the quenched height-height correlation function of the substrate.

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